Phone app is the best choice for most people, it uses GPS Satellites and Wifi and Cell towers to pin point your location.It's my understanding that the phone app works by triangulation of signals from cell towers. The GPS tracking device works with satellites. I'm sure a phone app can be very accurate riding from Boston to New York because there are always plenty of cell towers. But I live in Colorado. Cell coverage is spotty because of the mountains. That would especially be true if I were ridding over mountain passes and through canyons. I might get good enough reception to make a mediocre call but would I get the triangulation to pin point my location as I ride?
Has anyone used these phone apps in the mountains or far from cities?
Another question about the phone apps: is there a monthly fee? How much?
The most accurate is wifi and cell and satellite in that order pretty much.
Most people do not know when it comes to tracking, satellite does NOT transmit your location so your the device NEEDS to have a cell connection or wifi connection.
Here is how it works.
1. Google has pretty much mapped the entire country with streets, also in the street information google (and others) also have recorded the names of the wifi networks in the homes (yes, including everyones home reading this forum) and businesses on all the streets in the nation and most likely a lot of the world, so when you are on any given street, google and everyone who has an enabled app on their phone, knows EXACTLY where you are anytime of the day because you are near someones wifi router!
Ok, add to this, cell tower triangulation with the wifi and you have one heck of an accurate location device. All built into an app and for the heck of it, just about EVERY app on your phone knows where you are EVERY minute of the day because we all check "OK" everytime we download an app!
2. Ok, here is where you go wrong with Satellite GPS.
Its NOT possible for satellite GPS to transmit your location to anyone unless you have a cell connection or wifi connection, so it makes the choice for you simple, get an app for your phone and it will take care of everything. You have no other choice except for option #3 which maybe important enough for you to invest.
3. In order to be completely sure you can contact someone in an emergency a satellite phone is your only option and a satellite phone or position transmitter needs to be able to transmit to satellites.
Phone run anywhere from $300 to $1000 much like a regular cell, you can also by prepaid month etc, you can also rent.
I did a quick search, also found a "tracker" on amazon ...keep in mind, even if you buy the device, you will need to pay for a service from a satellite company, no different then a cell phone company.
Hope this was some help, sounds like your in for some NICE cruising!
and last, just google satellite phone service, you can even do rentals for your trip.
(oh CRAP, just spent 20 minutes replying to a TWO year old post ... *L* oh well, will leave it here)